Question: What are signs of mercury poisoning as a result of using butabarbital for treatment?
Paraphrase: What are signs of mercury harming as a result of utilizing butabarbital for treatment?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q408089 wdt:P780 ?answer . ?answer wdt:P2176 wd:Q410608}
Answer: insomnia